Most of the alignment in highways and railways is straight or tangent. Whenever there is a requirement to change the direction, a gradual change is brought in the alignment, which results in curves.
Curves are used in surveying alignments to change the direction of motion to lessen the forces involved when a vehicle changes direction is necessary.
Read the Article: Curve Surveying - Circular Curves : https://www.prodyogi.com/2022/03/curv...
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